Holly: Boron deficiency categories: Holly Holly Diseases Ornamentals Shrubs last review date: 2025-06-28 12:25 Necrotic spotting on leaves from boron deficiency Photo by: R.S. Byther Biology Boron deficiency in holly is characterized by the appearance of spots on the leaves. The spots initially are red to purple and irregularly shaped on the upper surface. They […]
Holly: Green algae categories: Holly Holly Diseases Ornamentals Shrubs last review date: 2025-06-28 12:33 Green algae on holly Photo by: B.M. Johnson Biology Green algae grows on the surface only of leaves, twigs, and trunks. Wet, humid weather favors development of these microscopic, moisture-loving, primitive plants. The colonized holly is not harmed unless sufficient algal […]
Holly: Phytophthora leaf & twig blight categories: Holly Holly Diseases Ornamentals Shrubs last review date: 2025-06-28 12:34 Holly Phytophthora leaf and twig blight Photo by: J.W. Pscheidt Biology Leaf and twig blight of holly is caused by a different Phytophthora species than is associated with root rots. Symptoms first appear in the fall and winter […]
Holly: Red leaf spotting categories: Holly Holly Diseases Ornamentals Shrubs last review date: 2025-06-28 12:38 Holly red leaf spotting Photo by: J.W. Pscheidt Biology Red leaf spotting of holly is a general category which includes physical or pesticide damage, nutritional deficiency, and disease symptoms. Damage from the holly’s own spines can cause leaves to develop […]